Kamahl's Druidic Vow [Dominaria]

Set: Dominaria Type: Legendary Sorcery Rare Cost: {X}{G}{G} (You may cast a legendary sorcery only if you control a legendary creature or planeswalker.) Look at the top X cards of your library. You may put any number of land and/or legendary permanent cards with converted mana cost X or less from among them onto the battlefield. Put the rest into your graveyard. Centuries ago, a barbarian laid his rage to rest.